JPS6215948B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to magnetic bubble storage devices.

In recent years, various configurations have been proposed to improve the performance of magnetic bubble memory elements, and one way to increase the data rate is (a) an odd-even method in which odd and even numbered bits are distributed to different storage area units. , (b) Double period method in which the number of bits between gates of the major line is essentially 1 bit (c)
Proposals are becoming more active for systems in which a plurality of storage area units having exactly the same pattern are driven in parallel, or (d) for a combination of these. What most of these systems have in common is that one storage element is composed of a plurality of storage area units that are separated in position. In addition, in the case of odd-even method,
Although the storage area units are not separated in terms of operating principle, they are separated in position, and therefore, in this specification, the odd side and the even side are each defined as a storage area unit.

FIG. 1 is a block diagram of a typical conventional odd-even type magnetic bubble storage device. (For details of the odd-even method, see U.S. Patent No.
No. 407-5611. ) This device 1 has swap gates 11 and 13 on the write side and replicate gates 21 and 23 on the read side.
It has a major line/minor loop configuration, with the left half being the odd side unit and the right half being the even side unit. In this device, the conductive layer consisting of a functional section for current controlling magnetic bubbles and its wiring section, and the soft magnetic layer consisting of a magnetic bubble transfer pattern have the same pattern on the left and right sides. Therefore, Otsudo side,
Both units on the even side are equipped with two generators and two detectors with a 1-bit interval difference, and the 1-bit difference from the generator to the swap gate between the odd side unit and the even side unit and the replica gate are detected. A one-bit difference from the gate to the detector is ensured by selecting the respective bonding terminals. That is, the generator 31 and detector 41 are selectively used in the odd side unit, and the generator 33 and detector 43 are selectively used in the even side unit, and the other generators 32, 34 and detectors 42, 44 are not used. Not yet. Note that detector 4
The outputs of 1 and 43 are subjected to noise cancellation by dummy detectors 45 and 46. In this way, dividing one element into a plurality of storage area units and repeating the same pattern in each storage area unit has a great advantage in mask production. Normally, from the viewpoint of the resolution performance of the reduction lens system of a step-and-repeater, the repetition unit is
It is desirable that the reticle pattern size, which is 10 times the size, is as small as possible, and with the above configuration, even if the element size is large, the repeating unit, that is, the reticle pattern size, can be small.
This is because it is possible to use a finer pattern and realize a magnetic bubble storage device with good operating characteristics.

However, simply arranging storage area units having the same pattern side by side as shown in FIG. 1 has several drawbacks as shown below. Firstly, in an attempt to reduce the number of external terminals of a package containing a wiring board 2 on which the present device 1 is mounted, and other parts (not shown) for driving magnetic bubbles such as a drive coil and a bias magnet, the wiring board 2 When an intersection 3 occurs in the wiring pattern and the wiring board has to have a two-layer structure, making it expensive, increasing the number of element divisions or using parallel connections to reduce gate drive voltage requires the wiring board to have a more multilayer structure. Second, wiring boards have a multilayer structure, and as the thickness increases, the internal volume of the drive coil wound around the wiring board increases, increasing the power consumption of the drive coil. Thirdly, the number of bonding points increases, which is unfavorable in terms of reliability and work man-hours.In the example shown in Fig. 1, there are as many as 40 bonding points.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic bubble storage device having a novel conductive wiring pattern configuration that eliminates the above-mentioned drawbacks without sacrificing the advantage of having a small repeating storage area unit.

The present invention provides a conductor pattern consisting of a functional part and its wiring part for current control of magnetic bubbles, and a soft magnetic material pattern for magnetic bubble transfer and electrical wiring formed on an insulating film covering the conductor pattern. Both have essentially the same pattern for each storage area, and the electrical connection between the conductive pattern wiring portion and the soft magnetic material pattern for electrical wiring is selected by the contact hole provided in the insulating film. This is achieved by

In other words, the present invention simplifies the wiring board and reduces the number of connection points with the wiring board by converging the number of terminals in the entire device while keeping the pattern of each divided storage area unit the same. Extremely beneficial effects can be obtained, such as:

The present invention will be explained below using the drawings.

FIG. 2 is a block diagram showing an embodiment of a magnetic bubble storage device according to the present invention. Since the operation of the overall structure of this device is the same as that of the element shown in FIG. 1 as a conventional technique, the explanation will be omitted, and here, the parts according to the present invention, especially the wiring relation, will be explained in detail.

In Fig. 2, the broken line is the device outline, the dashed line is the boundary of the storage area unit, the thin line is the conductive pattern consisting of the functional part and wiring part for magnetic bubble current control, and the thick line is the soft magnetic material for magnetic bubble transfer and wiring. The body patterns and small circles respectively indicate contact holes in the insulating film through which electrical connection is made between the wiring portions of the conductor pattern and the soft magnetic material pattern. In this embodiment, a common line is used to simplify the overall wiring. On the write side, generator power line b1 return line b2, swap gate power line b3 return line b4,
On the reading side, replicate gate power line b5 return line b6, detector, dummy detector signal line b7, b
A total of nine common lines (8 return lines b9) are provided.
However, the signal lines b7 and b8 related to the detector are on the external side,
Unnecessary parts common to the even side are deleted. All functional units are electrically connected to bonding terminals via these common lines.

What should be noted about this embodiment is that the wiring pattern for electrical connection between the functional section and the common line or between the bonding terminal and the common line also uses the soft magnetic material layer used for magnetic bubble transfer. The magnetic material pattern is the same on both the odd and even sides. That is, even if only one side of the odd side unit or even side unit is to be connected, a common wiring section is laid on both sides, and only the portions that are actually used are selected using contact holes. The wiring will be explained using a generator as a representative. The power supply side wiring 311, 331 of the generators 31, 33 on the odd side and even side, the bonding terminal 101 are connected to the common line b1, contact holes c1, c2, c3, c4, c5, c6, soft magnetic wiring parts l1, l2 , l3, and the return wiring 312, 332 and bonding terminal 102 are connected to the common line b2 through the contact hole c.
7, c8, c9, c10, c11, c12, and are connected via soft magnetic wiring portions l4, l5, l6. The common lines between odd and even units are also connected to contact holes c13, c14, and c1.
5, c16, and are connected via soft magnetic wiring portions l7, l8. Therefore, the four electrode wires of the two generators on the odd side and even side are converged into only one pair, 101 for power supply and 102 for return, at the bonding terminal. Also, in order to make the soft magnetic material pattern on the odd side and the even side the same, there is a
The two generators 31 and 32 are both provided with soft magnetic wiring parts l1, l4, l9, and l10, but the contact holes are provided only in the wiring parts l1 and l4 of the odd generator 31, and are not included. The necessary even generator 32 is not utilized. In FIG. 2, there are several soft magnetic wiring portions that are not terminated by contact holes, but these are all laid to make the soft magnetic material patterns on the odd side and the even side the same.

In order to help understand the state of electrical connection by contact holes, the explanation will be made using FIG. 3. FIG. 3 shows a portion 203 where the conductive wiring portion 201 and the soft magnetic wiring portion 206 intersect with each other and a contact hole 204 of the element shown in FIG.
3 is a diagram illustrating a cross section of the film of a portion 205 where electrical connection is made between the soft magnetic wiring portion 206 and the soft magnetic wiring portion 206. FIG. 2000 Å SiO ₂ 207 as a spacer, 100 Å Ta and 3500 Å Au as conductor layers were successively deposited,
The functional part and wiring part 203 are patterned by ion milling, a 3000 Å SiO ₂ film 208 is formed, and a contact hole 204 is formed by chemical etching. Next, a 4000 Å NiFe film is formed, a magnetic bubble transfer path and a wiring portion 206 are patterned by ion milling, and a 6000 Å SiO ₂ film 209 for passivation is deposited. Finally, the bonding terminal 210 is opened by chemical etching.

As can be seen from the explanations in Figures 2 and 3, the functional parts that are to be used on both the odd and even sides are selected and used by connecting them to the common line using contact holes and soft magnetic wiring. Since the bonding terminals to be used are also selected by connecting to the common line, the conductor pattern and soft magnetic material pattern, which require fine patterns, can be made the same on the odd and even sides, and the reticle pattern size is small. It's done. On the other hand, since the contact hole pattern does not require a particularly fine shape, there is no problem even if the reticle pattern size is large and differs between the odd side and the even side. Also, the bonding score is also the highest
As in the example above, the score was halved to 18 points.

In the above embodiments, the case where the storage area unit is two in the odd-even method is explained, but the present invention is not limited to this, and can be applied even if one element is divided into three or more storage area units. , and it is clear that the effect will become even greater.

As described above, in the magnetic bubble storage device according to the present invention, even if one device is divided into a plurality of storage areas, the bonding terminals are converged, so the wiring board is simplified, and the power consumption of the drive coil is accordingly simplified. is small and the number of bonding points can be reduced.
It is extremely useful industrially in terms of economy and reliability.
Furthermore, the effectiveness of the present invention increases as the number of divisions in one device increases, and the storage capacity will continue to increase in the future.
The effect is significant because the number of divisions tends to increase in order to maintain and improve performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional magnetic bubble memory element, and FIGS. 2 and 3 are block diagrams of a magnetic bubble memory element according to the present invention. 1...Magnetic bubble memory element, 2...Wiring board,
3,203...Wiring intersection, 11,13...Write gate, 21,23...Read gate, 31,
32, 33, 34... Generator, 41, 42, 4
3,44...detector, 45,46...dummy detector, 101,102,210...bonding terminal, 311,312,331,332...generator wiring section, 201...conductor pattern, 206, l1
~l8...Soft magnetic wiring section, 204, c1~c1
6...Contact hole, 207, 208, 20
9...Insulating film.

Claims (1)

[Claims] 1. In a magnetic bubble storage device that is equipped with at least a generator, a detector, and a storage loop and has a plurality of positionally separated storage area units, a conductor consisting of a functional part and a wiring part for controlling the current of magnetic bubbles. Both the pattern and the soft magnetic material pattern for magnetic bubble transfer formed on the insulating film covering the conductor pattern are all the same in each storage area,
A soft magnetic material of the same layer as the soft magnetic material pattern is used for the wiring part for connecting between the functional part and the bonding terminal within the storage area unit and the wiring part for interconnecting the storage area units, and the soft magnetic material is A magnetic bubble storage device characterized in that the body pattern is also the same for each storage area, and a necessary functional section is selected for each storage area by a contact hole provided in the insulating film.